What clustered file system (s) are supported for storage pool that will be shared In Oracle VM?

What clustered file system (s) are supported for storage pool that will be shared In Oracle VM?

A.
GFS only

B.
GFS and NFS only

C.
OCFS2 only

D.
OCFS2 and GFS only

E.
GFS, OCFS2 and NFS

F.
NFS only